Medical Grade Products (MGP) are regulated by the FDA to contain ingredients that are 99% pure hence the fact that they must be purchased from a skin care professional under the supervision of a physician. MGP have the ability to reach deeper layers of skin to provide visible results and correct issues.
Over the Counter Products (OTC) have significantly less active ingredients, full of synthetic fillers, & water, that make their effectiveness minimal. They only treat the most surface layer of the skin making their capability to provide results much lower. OTC Products are bought from drugstores, grocery stores, convenience stores, department stores, online websites, & direct sales aka Rodan & Fields, Arbonne, Mary Kay, etc.